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nfsd: fix error handling in nfs4_set_delegation() 

I noticed a memory corruption crash in nfsd in
4.17-rc1. This patch corrects the issue.

Fix to return error if the delegation couldn't be hashed or there was
a recall in progress. Use the existing error path instead of
destroy_delegation() for readability.

Signed-off-by: Andrew Elble <aweits@rit.edu>
Fixes: 353601e7d3 ("nfsd: create a separate lease for each delegation")
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Andrew Elble 2018-04-18 17:04:37 -04:00 committed by J. Bruce Fields
parent 3171822fdc
commit 692ad280bf
1 changed files with 4 additions and 1 deletions
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5
fs/nfsd/nfs4state.c
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@ -4378,8 +4378,11 @@ nfs4_set_delegation(struct nfs4_client *clp, struct svc_fh *fh,
spin_unlock(&state_lock);
if (status)
destroy_unhashed_deleg(dp);
goto out_unlock;
return dp;
out_unlock:
vfs_setlease(fp->fi_deleg_file, F_UNLCK, NULL, (void **)&dp);
out_clnt_odstate:
put_clnt_odstate(dp->dl_clnt_odstate);
out_stid: